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Status Not under consideration
Workspace z/OS
Categories BCP_Scheduler
Created by Guest
Created on Feb 8, 2023

RELATED IDEAS

Implement JCL parameter that only considers GP time

In JCL the TIME parameter is used to limit the CPU time of jobs. Originally used to limit CPU times to save costs and find looping jobs. Through the introduction of Java this parameter will "misbehave" or leads to misunderstanding. Those jobs will be shutdown long before actual GP time limit is reached. Because Java runs on TCB in zIIP so therefore those times are also considered in the calculation for JCL TIME. That means if someone is using Java this limitation of CPU time through JCL TIME must be set with a new value... Means remeasuring. Very unproductive because that must be done for every job.

It would be better to have a JCL parameter that really reflects only CPU time spent on GP. Customers could leave the value that is already set untouched and only need to replace the parameter itself.


In JES2 these TCB on zIIP times are also considered (IEF032I output).


It would be great to

  • Implement a JCL parameter that really only takes GP time into account

    • Not adding the values of Java TCB like the JCL TIME parameter

  • Enhance documentation of JCL TIME by adding the hint or information that also Java TCB times are also added to this value.

That would prevent misunderstanding and the requirement to explain this specific behavior when using Java.


Thank you very much.


Idea priority Medium
  • Guest
    Reply
    |     Mar 31, 2023
    This item is unlikely to be given high enough priority to be placed into the product plan. However, IBM will review the documentation of the TIME parameter in JCL for potential improvements.

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